Stuck on a sudoku you found in a newspaper, a book, or another site? Type the clues into the grid below and hit Solve. The solver runs in your browser, no server round-trip, no signup, no ads.
Type the given numbers from your puzzle into the grid. Leave empty cells blank. Hit Solve. The solver runs a constraint-propagating backtracking algorithm, the same one Melio uses to validate every puzzle we generate. Solutions usually come back in under 50ms.
The Check uniquenessbutton tells you whether your puzzle has exactly one solution (the gold standard for “real” sudoku) or multiple. Multiple solutions usually means a clue is missing or a clue is wrong.
Nothing you type leaves your device. The solver is entirely client-side.